Recently I bought vst connect pro for stream my mix to client with studio pass app, so far i don't need for recording, just stream my mix to client and videochat, but it has some problem :
1. in studio pass (client) cannot send any audio or video, video screen blank (front and rear camera) and no volume movement in "to studio" fader level. i tried with iphone 6s & iphone x with ios 12. client can hear my mix, talk back and video
2. hard to make connection.

I don't know whether this is a problem with the studio pass or vst connect.

I have similar problems in Nuendo 10 and VST Connect Pro and I'm trying to achieve a similar goal: have my client sit in on a voice-over session.

So far I have managed to get audio from Nuendo to my iPhone Xs (iOS 12), including Talkback. I haven't tried video, because I don't have a webcam. I can also move the Mic and Studio sliders with my phone as well as with Nuendo.

But going from my iPhone to Nuendo is a different story. No sound and no video. I'm assuming the iPhone mic should work as the talkback mic for the client, right?

One more problem: I was trying to change the buffer size setting in the Performer tab. It was on 1024 and when I clicked on it it changed to 64, which is way too low. However, it won't go back, because there are no options available. No matter how I click on it, it only gives me 64.

Then I decided to try the Performer application. Version 4 didn't work at all. The whole screen was blank, I mean just a white window. Then I downloaded version 3 and finally I got everything to work, including video and talkback.

I think the Performer app is the way to go, assuming the client has a laptop of some kind. It worked for as long as I test drove it at least.